Understanding the Current State of Module Quality – Key Takeaways From PVRW 2026

Why It Matters

Rising module failures increase O&M costs, insurance claims, and project risk, threatening the solar sector’s profitability. Addressing these quality gaps is essential for investors, developers, and policymakers to sustain growth and confidence in renewable energy.

Key Takeaways

• Rear glass more prone to hail‑induced breakage.
• Field module failure rates reach 1‑5 % under normal conditions.
• Creepage violations cause short circuits and fire risks.
• Connector defects can cost millions in remediation.
• New test plans target asymmetric load and hail failures.

Pulse Analysis

The 2026 Photovoltaic Reliability Workshop underscored a worrying uptick in module quality failures, with hail and wind events exposing a structural weakness in rear glass. Studies from NLR and Kiwa PVEL showed that rear panes fracture more readily than front glass, while spontaneous breakage under moderate winds highlighted deficiencies in edge compression and interconnect pressure. These findings suggest that current design tolerances may not reflect the increasingly extreme weather patterns confronting solar farms, prompting manufacturers to revisit glass‑glass bonding strategies and mechanical load margins, and to meet evolving certification standards.

Beyond physical damage, the conference revealed a systemic gap between advertised performance and field reality. Independent power producers mocked PAN files as “entertainment,” emphasizing the need for third‑party verification, while DNV reported 1‑5 % module breakage under normal conditions and highlighted the prevalence of non‑binding compatibility letters. Cell‑level issues such as flux‑driven corrosion in TOPCon metallisation and PID in POE‑based BOMs further erode output, and average degradation rates of 0.7 % per year exceed warranty assumptions, raising O&M cost concerns for investors and asset managers.

In response, Kiwa PVEL announced an updated PQP test plan that adds load‑to‑failure and asymmetric hail testing, aiming to capture the complex failure modes now observed in the field. Parallel efforts by the independent engineering community seek to embed reliability risk into financial models, acknowledging that capex‑only procurement underestimates long‑term exposure. A new industry working group will draft guidance on quantifying reliability costs, while emerging drone‑enabled photoluminescence tools promise faster, more accurate inspections, potentially reshaping warranty and insurance practices across utility‑scale and distributed projects.